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Following a new EPA rule, public water systems will have five years to address instances where there is too much PFAS in tap water – three years to sample their systems and establish the existing levels of PFAS, and an additional two years to install water treatment technologies if their levels are too high. Justin Sullivan/Getty Images hide caption

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Justin Sullivan/Getty Images

Eva Stebel, water researcher, pours a water sample into a smaller glass container for experimentation as part of drinking water and PFAS research at the U.S. Environmental Protection Agency Center For Environmental Solutions and Emergency Response, Feb. 16, 2023, in Cincinnati. Joshua A. Bickel/AP hide caption

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Joshua A. Bickel/AP

A study released by the U.S. Geological Survey on Wednesday estimates that at least 45% of U.S. tap water could be contaminated with at least one form of PFAS, which could have harmful health effects. Rogelio V. Solis/AP hide caption

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Rogelio V. Solis/AP